chemical engineering fluid mechanics for chemical chemical engineering MCQs – Page 16

Practise multiple-choice questions from chemical engineering fluid mechanics for chemical chemical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering fluid mechanics for chemical chemical engineering Mcqs
301. Hydraulic _____________ works on the principle of Pascals law of transmission of fluid pressure?
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A. Turbine

B. Pump

C. Coupling

D. Press
302. Which of the following denotes the effect of compressibility in fluid flow ?
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A. Euler number

B. Weber number

C. Mach number

D. Reynolds number

303. Capacity of a rotary gear pump can be varied by__________________?
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A. All A., B. and C.

B. Bypassing liquid from the suction or discharge line

C. Changing the speed of rotation

D. Bleeding air into suction

304. The equivalent diameter for flow through a rectangular duct of width B and height H is___________________?
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A. HB/(H + B)

B. 2HB/(H + B)

C. 4HB/(H + B)

D. HB/2 (H + B)

305. The fluid velocity varies as the square of the cylindrical pipe diameter, in case of steady state laminar flow at constant pressure drop, for ______________ fluid?
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A. Dilatant

B. Newtonian

C. Pseudo-plastic

306. The schedule number of a pipe is an indication of its_________________?
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A. Size

B. Material density

C. Roughness

D. Wall thickness
307. Co-efficient of discharge (Cd) is defined as actual discharge/theoretical discharge and is equal to Cc . Cv; where Cc = Co-efficient of contraction and Cv = co-efficient of velocity. Cd of an orifice is usually about__________________?
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A. 0.42

B. 0.82

C. 0.98

D. 0.62
308. The Prandtl mixing length is_________________?
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A. Zero at the pipe wall and is a universal constant

B. Independent of the shear stress

C. Independent of radial distance from the pipe axis

D. Useful for computing laminar flow problems
309. A centrifugal pump has the following specifications: Power = 4 H.P.; Speed = 800 rpm Head = 8 metres Flow = 1000 litres/minutes. If its speed is halved, then the new head will be ______________ metres?
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A. 5.5

B. 2

C. 4

D. 8

310. Hydraulic mean depth (Dm) for a circular pipe of diameter D flowing full is 0.25 D. For a circular channel, at Dm = 0.3 D, gives the condition for the maximum ?
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A. Flow rate

B. Mean velocity

C. Both a & b

D. Neither a nor b

311. The line traced by a single fluid particle as it moves over a period of time is called ______________ line?
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A. Equipotential

B. Stream

C. Path

D. None of these

312. Potential function is applicable only for __________ flow?
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A. Turbulent

B. Steady

C. None of these

D. Irrotational
313. The pressure intensity is the same in all directions at a point in a fluid________________?
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A. When there is no motion of one fluid layer relative to an adjacent layer

B. Only when the fluid is at rest having zero velocity

C. Regardless of the motion of one fluid layer relative to an adjacent layer

D. Only when the fluid is frictionless

314. The capacity of a centrifugal pump Can be increased by increasing the_________________?
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A. Number of pumps and joining them in series

B. Number of pumps and joining them in parallel

C. Impeller diameter or speed

D. All A., B. and C.
315. The head developed by a centrifugal pump is largely determined by the____________________?
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A. Vapour pressure of the liquid

B. Nature of the liquid being pumped

C. Power of the pump

D. Angle of the vanes and the speed of the tip of the impeller
316. With decrease in particle size to be fluidised by a particular fluid, the operating range of fluidisation velocity___________________?
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A. Widens

B. Unpredictable from the data

C. Does not change

D. Squeezes

317. The momentum correction factor for the velocity distribution of laminar flow is____________________?
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A. 2.5

B. 1.66

C. None of these

D. 1.3

318. In a fully turbulent flow (Re > 105) in a pipe of diameter d, for a constant pressure gradient, the dependence of volumetric flow rate of an incompressible fluid is_______________?
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A. d4

B. d2.5

C. d

D. d2

319. A rectangular surface 3? 4?, has the lower 3 edge horizontal and 6? below a free oil surface (sp. gr. 0.8). The surface inclination is 300 with the horizontal. The force on one side of the surface is (where, y = specific weight of water) ?
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A. 39.6y

B. 58y

C. 49.2y

D. 48y
320. Reynolds number for water flow through a tube of I.D. 5 cm is 1500. If a liquid of 5 centipoise viscosity and 0.8 specific gravity flows in the same pipe at the same velocity, then the pressure drop will______________________?
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A. Increase

B. Decrease

C. Data insufficient to predict pressure drop

D. Remain same